<?php
echo sqrt(num: 9), "\n";

echo cos(num: 60*pi()/180), "\n";
echo cos(deg2rad(num: 60)), "\n";
echo pow(num: 3,exponent: 2), "\n";
echo round(num:3.1415926,precision: 1) , "\n";
echo round(num:3.1415926,precision: 3) , "\n";
